type recognition, *creating* tables from CSVs

László Sándor sandorl at gmail.com
Thu May 15 11:29:18 CEST 2014


Thanks, Radovan — I think I will try Hannes's importer Python script first,
but it's good to know about Kettle!
http://dba.stackexchange.com/a/65174/38399

Laszlo


On Thu, May 15, 2014 at 8:13 AM, Radovan Bičiště <
radovan.biciste at ceosdata.com> wrote:

> Hi,
> AFAIK the tables must exist.
> The documentations is here: https://www.monetdb.org/Documentation/Manuals/
> SQLreference/CopyInto
>
> Slightly helpful could be to use KETTLE ETL Tool (
> http://community.pentaho.com/projects/data-integration/) which is free.
> You can create a process for loading the CSV files. When you create a
> transformation using Monet Bulk Loader, there is an option (button SQL) to
> create table based on incoming fields from a CSV file. Let me know if it
> sounds interesting so I could elaborate further. :)
>
> Hope that helps.
>
> Radovan
>
>
>
> On 05/14/2014 09:06 PM, László Sándor wrote:
>
>> Hi,
>> I asked a question on DBA of StackExchange about MonetDB, but as there
>> is not even a monetdb tag in use, maybe it wasn't the right forum for
>> it. Please have a look over there, or I can repeat it below:
>> http://dba.stackexchange.com/q/65126/38399
>>
>> I am confused whether you can copy records into a *new* table in MonetDB.
>>
>> The official documentation seems[1] to talk only about copying into
>> existing tables. I have quite a large universe of billions of records in
>> dozens of tables, and I would much prefer a solution that inferred the
>> type from the CSV itself, and the column names from the first rows.
>>
>> A StackOverflow answer[2] seems to work for SQL Server 2000 with
>> `OpenRowset`, though even they are not concerned about data-type
>> inferencing.
>>
>> Another answer[3] here on DBA recommends `BCP` before calling `BULK
>> INSERT` in Server 2000, neither of which is discussed in the MonetDB
>> documentation.
>>
>> Other answers[4] also suggest that this is impossible in MySQL without
>> external scripts.
>>
>> The background of my issues are that I realized that managing my raw
>> data (which came in text files from government agencies, with scarce
>> documentation) should be separate from the front-end of my analysis
>> still kept in Stata. This is similar to what has been achieved with
>> MonetDB.R (e.g.
>> hannes.muehleisen.org/SSDBM2013-databases-and-statistics.pdf
>> <http://hannes.muehleisen.org/SSDBM2013-databases-and-statistics.pdf>),
>>
>> though probably limited to an odbc link (so missing some of the real
>> benefits coming from merging and calculations done in MonetDB). That
>> said, this is the only sign of a Stata and MonetDB link I could find:
>> http://www.stata.com/statalist/archive/2012-08/msg01363.html
>>
>> Disclaimer: I am an SQL and MonetDB newbie, but thanks for not letting
>> me miss the obvious.
>>
>>
>>    [1]: https://www.monetdb.org/Documentation/Manuals/
>> SQLreference/CopyInto
>>    [2]: http://stackoverflow.com/a/10421034/938408
>>    [3]: http://dba.stackexchange.com/a/22763/38399
>>    [4]: http://dba.stackexchange.com/a/61969/38399
>>
>>
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>
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